LYHBeyond, the Blackwater CSO Tunnel Project

The Blackwater Combined Sewer Overflow (CSO) Tunnel creates storage capacity and infrastructure to protect the James River from combined storm and sewer events.

The 4,700-foot, 12-foot-diameter tunnel features several diversion and overflow structures, which push excess flows from the Blackwater Creek Interceptor and James River Interceptor into the tunnel, pump station, and electrical building to maintain electrical, instrumentation, and control components.